1321234355403 has 24 divisors (see below), whose sum is σ = 1915920228768. Its totient is φ = 877377940992.

The previous prime is 1321234355381. The next prime is 1321234355429. The reversal of 1321234355403 is 3045534321231.

1321234355403 is a `hidden beast` number, since 1 + 3 + 212 + 3 + 4 + 35 + 5 + 403 = 666.

It is not a de Polignac number, because 1321234355403 - 2²⁵ = 1321200800971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321234355603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5194626 + ... + 5443032.

It is an arithmetic number, because the mean of its divisors is an integer number (79830009532).

Almost surely, 2^{1321234355403} is an apocalyptic number.

1321234355403 is a deficient number, since it is larger than the sum of its proper divisors (594685873365).

1321234355403 is a wasteful number, since it uses less digits than its factorization.

1321234355403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250723 (or 250720 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 1321234355403 its reverse (3045534321231), we get a palindrome (4366768676634).

The spelling of 1321234355403 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-four million, three hundred fifty-five thousand, four hundred three".